* Set proper zscale transfer value in the video_hdr_to_sdr_func() function, option 0 (copy color characteristics)
* Use a desat value of 2.5 for the tonemap filter when doing HDR to SDR conversions
* Don't use pix_fmts in the format filter. It is not really needed
* Removed 12-bit options from the video_pixfmt_func() function
* Cosmetics

* Disabled audio metadata for batch mode when using audio copy, until I figure out how to do it in a decent way
* Removed default software scaler parameters for bicubic/spline. They are already the default in FFmpeg so no need to force them
* Use a case statement instead of if condition in option 0 of the video_hdr_to_sdr_func() function

* Moved the eq filter to almost the end of the video filter chain as it can lead to banding in certain cases in case the filter is in front of most other ones
* If the eq filter is used, also insert the format one after it if a pixel format has been chosen